the other option is what i did... custom rotors vis a vis the group b uy... Now i have a spare set of rings sitting in my garage for my next brake job. i think the rings cost me $300 or so for the pair.
Jimmy's group buy from last year.
But.. if you can get a PAIR of rotors for $500... that seems like a good deal. Not like my nsx tho... pads are $75 for the pair, and rotors something like $150 for the pair.